Define solar eclipse...!!
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A solar eclipse occurs when a portion of the Earth is engulfed in a shadow cast by the Moon which fully or partially blocks sunlight. This occurs when the Sun, Moon and Earth are aligned. Such alignment coincides with a new moon (syzygy) indicating the Moon is closest to the ecliptic
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The conduction system of the heart works this way: The SA node is known a natural pacemaker because it sets the pace of the heartbeat. It is where cardiac muscle contraction begins, from an impulse which causes the right and left atria to contract and push blood into the ventricles.
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